# std::is_floating_point

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< cpp‎ | types

Defined in header `<type_traits>` |  |
template< class T > struct is_floating_point; |  | (since C++11)

`std::is_floating_point` is a UnaryTypeTrait.

Checks whether `T` is a floating-point type. Provides the member constant value which is equal to true, if `T` is the type float, double, long double, or any extended floating-point types (std::float16_t, std::float32_t, std::float64_t, std::float128_t, or std::bfloat16_t)(since C++23), including any cv-qualified variants. Otherwise, value is equal to false.

If the program adds specializations for `std::is_floating_point` or `std::is_floating_point_v`, the behavior is undefined.

### Template parameters

T | - | a type to check

### Helper variable template

template< class T > constexpr bool is_floating_point_v = is_floating_point<T>::value; |  | (since C++17)

## Inherited from std::integral_constant

### Member constants

value [static] | true if `T` is a floating-point type (possibly cv-qualified), false otherwise (public static member constant)

### Member functions

operator bool | converts the object to bool, returns value (public member function)
operator() (C++14) | returns value (public member function)

### Member types

Type | Definition
`value_type` | bool
`type` | std::integral_constant<bool, value>

### Possible implementation

    template<class T>
    struct is_floating_point
         : std::integral_constant<
             bool,
             // Note: standard floating-point types
             std::is_same<float, typename std::remove_cv<T>::type>::value
             || std::is_same<double, typename std::remove_cv<T>::type>::value
             || std::is_same<long double, typename std::remove_cv<T>::type>::value
             // Note: extended floating-point types (C++23, if supported)
             || std::is_same<std::float16_t, typename std::remove_cv<T>::type>::value
             || std::is_same<std::float32_t, typename std::remove_cv<T>::type>::value
             || std::is_same<std::float64_t, typename std::remove_cv<T>::type>::value
             || std::is_same<std::float128_t, typename std::remove_cv<T>::type>::value
             || std::is_same<std::bfloat16_t, typename std::remove_cv<T>::type>::value
         > {};

### Example

Run this code

    #include <type_traits>

    class A {};
    static_assert(!std::is_floating_point_v<A>);

    static_assert(std::is_floating_point_v<float>);
    static_assert(!std::is_floating_point_v<float&>);
    static_assert(std::is_floating_point_v<double>);
    static_assert(!std::is_floating_point_v<double&>);
    static_assert(!std::is_floating_point_v<int>);

    int main() {}

### See also

is_iec559 [static] | identifies the IEC 559/IEEE 754 floating-point types (public static member constant of `std::numeric_limits<T>`)
is_integral (C++11) | checks if a type is an integral type (class template)
is_arithmetic (C++11) | checks if a type is an arithmetic type (class template)
floating_point (C++20) | specifies that a type is a floating-point type (concept)

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